Throughout the reflection, make sure you have a copy of the Student Guide and your data tables. Use the drop-down menus to complete the statements. The independent variable, the one that is intentionally manipulated, is ✔ the physical properties . The dependent variable, the one that you measure the response in, is ✔ the pH of the solution . The words with the check marks next to them are the answers your welcome .

metals are good conductor of electricity. it has free electrons on their surface. according to electron pool theory, each atom present in a metal crystal losses all of its valence electron and as a result a pool of free is form. these pool of electrons are free to move and   conduct electricity easily   while making metal as good conductor.

the correct answer is a. the ability of electrons to flow throughout the metal.

if it's not useful, feel free to report for mistake in answer.

the answer is d. matter from the air combined with the steel wool.